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C. O. DUFFY.

PROCESS OF PRODUCING TIRE PATCH MATERIAL.

APPLICATION mu) MAY 6. I919.

Patented May h '20.

CLARENCE O. DUFFY, 03' DALLAS, TEXAS.

PROCESS OF PRODUCING TIRE-PATCH MATERIAL.

Specification of Letters Patent.

Patented May 11, 1920.

Applicatlon filed May 6, 1919. serial N0. 295,198.

To all whom it may concern:

Be it known that IyGn-mnncn 0. Perry, a citizen of the UnitedStates,residm at Dallas, in the county of Dallasan'd lists of Texas, haveinvented certain new and useful Improvements in Processes of ProducingTire-Patch-Material, of which the following is a specification.

This invention relates to new and useful improvements in :tire patchesand processes of reducing the same.

here are certain features which are highly desirable in a tire atchamong which are elasticity whereby t e patch conforms to the contour ofthe tube and also lends itself to the distortions of the latter; thequalit of being waterproof whereby its la ers wi not separate when wet;an an e cient adhesive layer or side which may be secured to the tube ina substantialmanner.

The purpose of m invention is to attain these and other highly desirableresults and do so by means 0 a process which involves the impregnatingoften elastic fabric with rubber and then curing the same-underpressure; then applying raw rubber on one side of the fabric andvulcanizinga; andthen ap lying a rubber compound to e other or adhesiveside and then cooking or curing the same to a certain-do ree.

The patch produced as a rubber filled fabric which will not absorb waterb capillary attraction and which is bon ed to its rubber layers on. eachside by means of its rubber filler. The unvulcanized layer has qualitiespeculiar to, itself and is unlike the usual unvulcanized layer. becauseit is com osed-ofa compound and does not ,depend upon .itsadhesiveitself to the tube.

This invention will be more readily understood from a. reading of thefollowing specification and by reference to. the accompanyingdrawings,.in which an example of the invention is shown and wherein:

Figure 1 is a view showings patch ma terial composed of layers producedin accordance with this invention, some of the layers being (partiallystripped off and pertions remove and Fig. 2 is an edge view of thematerial.

In the drawings A designates the inner layer of a patch, said layer hemapplied to the inner tube. A fabric layer is interproperties to attachposed between the inner layer and an outer ayer (l. A protective sheetor la er Dis attached to the face of the la '61":

In manufacturing the pa ch-material the fabric layer or sheet B isreduced first. A loosely woven fabric capa le of stretchng in alldirections is used. This fabric 18 impregnated with. rubber by coatingwith plastic rubber and then curing by steam vulcanizing under apressure of" several hundred pounds,800 pounds having been foundsatisfactor The fabric layer thus treated will have every fiber coatedwith rubber; proof all the we through To one side 0 the fabric layer alayer of raw rubber of the desired thickness is appliedythis layer issteam vulcanized in the usual manner and the layer 0 produced.

One of the very important steps is the production of the layer A. Iprepare a compound of raw rubber, and vegetable matter in suitable proortions and in the form of a sheet. This s set of compound rubber isplaced on the otherside of the fabric la er and cooked by thevulcanizingprocess. he work must beinspected during this cooking rocessbecause the vulcanizing must not ecome complete For instance if-25minutes are required to completely vulcanize the usual (patch material,the layer A must be remove before the expiration of this period.

The protective layer D of glazed or other fabric is applied to the face'of the layer A. which latter is sufliciently adhesive to adhere to thelayer D. The layer A is soft and plastic but I donot depend upon its badhcsiveness to secure the patch to the to e.

In repairing, a tube a etch of the desired size and shape is cut mm thematerial and the protective layer D removed. It is only necessary toroughen and clean the tube by an abrading material such as sandaper,butno cleanin fluid such as seeene is used nor is sucli desirable. Suitableair drying rubber cement such as is now commonly manufactured, isapplied to the tube and the face of thereto. The specially treated layerA readily adheres and the re air is complete. This atch does not de enupon frictional heat or vulcenizing so called) it on'the it will berubber filled and water the layer A applied tube. After it is onceapplied it cannot be dislodged or creep. The work is quickly done and apermanent patch is had.

It will be seen that tie fabric layer B being highly elastic will permitthe etch to stretch in any direction and furt ier said fabric beingwaterproof will not absorb water and shed its layers. This rubber filledfabric layer forms a better bond'between the rubber layers andstrengthens the etch because it is {reserved by its rubber filling. Thelayer is most highly importent as both its structure and its curing tothe effective cementing of the patch to the inner tube.

This invention is in some respects an 1mrovement on my Letters PetentN-umber 1,290,128, issued January 7, 1919, in so fer as the disclosureis concerned but has noth ing in common with the bevel edge element Thespecification 0t said Letof the claim.

does not disclose the present ters Potent 1,ese,eee

process and is believed to cover only at abric luyer inter osed betweenrubber ln ers which was roadl old in the art w en the patent was appliedfor.

What I claim is:

The herein-described process of producing a tire petch meteria whichconsists in applyin a la er of raw rubber to one side of a fu ln-icimpregnated with vulcanized rubber, subjectin such leyer of raw rubberto ,the action 0 heat to completely vulcnnize the same, subsequentlyapplyin a rubber compound containing rnw rubies: and an adhesive to theopposite side of the fabric, and then subjecting such rubber compound tothe action of heat for n period short of the time necessary tocompletely vulcanize the raw rubber whereby the raw rubber in thecompound is in a. partly cured state.

In testimony whereof I aiffix my si nature.

CLARENCE O. D 4 FY.

